projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1ccea77e | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| c7fe3b52 AAJ |
2 | /* |
| 3 | * Copyright (C) 2011 Instituto Nokia de Tecnologia | |
| 4 | * | |
| 5 | * Authors: | |
| 6 | * Aloisio Almeida Jr <aloisio.almeida@openbossa.org> | |
| 7 | * Lauro Ramos Venancio <lauro.venancio@openbossa.org> | |
| c7fe3b52 AAJ |
8 | */ |
| 9 | ||
| 10 | #include <linux/nfc.h> | |
| 3a9a231d | 11 | #include <linux/module.h> |
| c7fe3b52 AAJ |
12 | |
| 13 | #include "nfc.h" | |
| 14 | ||
| 15 | static DEFINE_RWLOCK(proto_tab_lock); | |
| 16 | static const struct nfc_protocol *proto_tab[NFC_SOCKPROTO_MAX]; | |
| 17 | ||
| 18 | static int nfc_sock_create(struct net *net, struct socket *sock, int proto, | |
| 0a40acb2 | 19 | int kern) |
| c7fe3b52 AAJ |
20 | { |
| 21 | int rc = -EPROTONOSUPPORT; | |
| 22 | ||
| 23 | if (net != &init_net) | |
| 24 | return -EAFNOSUPPORT; | |
| 25 | ||
| 26 | if (proto < 0 || proto >= NFC_SOCKPROTO_MAX) | |
| 27 | return -EINVAL; | |
| 28 | ||
| 29 | read_lock(&proto_tab_lock); | |
| 30 | if (proto_tab[proto] && try_module_get(proto_tab[proto]->owner)) { | |
| 11aa9c28 | 31 | rc = proto_tab[proto]->create(net, sock, proto_tab[proto], kern); |
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32 | module_put(proto_tab[proto]->owner); |
| 33 | } | |
| 34 | read_unlock(&proto_tab_lock); | |
| 35 | ||
| 36 | return rc; | |
| 37 | } | |
| 38 | ||
| 173e7837 | 39 | static const struct net_proto_family nfc_sock_family_ops = { |
| c7fe3b52 AAJ |
40 | .owner = THIS_MODULE, |
| 41 | .family = PF_NFC, | |
| 42 | .create = nfc_sock_create, | |
| 43 | }; | |
| 44 | ||
| 45 | int nfc_proto_register(const struct nfc_protocol *nfc_proto) | |
| 46 | { | |
| 47 | int rc; | |
| 48 | ||
| 49 | if (nfc_proto->id < 0 || nfc_proto->id >= NFC_SOCKPROTO_MAX) | |
| 50 | return -EINVAL; | |
| 51 | ||
| 52 | rc = proto_register(nfc_proto->proto, 0); | |
| 53 | if (rc) | |
| 54 | return rc; | |
| 55 | ||
| 56 | write_lock(&proto_tab_lock); | |
| 57 | if (proto_tab[nfc_proto->id]) | |
| 58 | rc = -EBUSY; | |
| 59 | else | |
| 60 | proto_tab[nfc_proto->id] = nfc_proto; | |
| 61 | write_unlock(&proto_tab_lock); | |
| 62 | ||
| 63 | return rc; | |
| 64 | } | |
| 65 | EXPORT_SYMBOL(nfc_proto_register); | |
| 66 | ||
| 67 | void nfc_proto_unregister(const struct nfc_protocol *nfc_proto) | |
| 68 | { | |
| 69 | write_lock(&proto_tab_lock); | |
| 70 | proto_tab[nfc_proto->id] = NULL; | |
| 71 | write_unlock(&proto_tab_lock); | |
| 72 | ||
| 73 | proto_unregister(nfc_proto->proto); | |
| 74 | } | |
| 75 | EXPORT_SYMBOL(nfc_proto_unregister); | |
| 76 | ||
| 77 | int __init af_nfc_init(void) | |
| 78 | { | |
| 79 | return sock_register(&nfc_sock_family_ops); | |
| 80 | } | |
| 81 | ||
| 82 | void af_nfc_exit(void) | |
| 83 | { | |
| 84 | sock_unregister(PF_NFC); | |
| 85 | } |